. . . . . . circulates blood to different parts of the body.

Which one of the statements is correct with reference to the circulation of blood in a mammal?

Which of the following structures is absent in a rabbit's heart?

$A$ specialised nodal tissue embedded in the lower corner of the right atrium,close to the atrioventricular septum,delays the spreading of impulses to the heart apex for about $0.1 \; sec$. This delay allows:

Which structure first generates an action potential?

The tricuspid valve is present at the origin of